To avoid serious consequences caused by photovoltaic system suddenly loss connection from the power grid when power grid disturbances or malfunctions happened, this paper researches LVRT control strategy of super-capacitor-based photovoltaic systems. When the grid voltage drops, the super capacitor is used to absorb the active power, balance DC bus voltage, and reduce the power injected into the inverter to prevent the inverter overcurrent. Simulation results show that this method greatly improves the photovoltaic system's low voltage ride through capability, ensures the safe operation of the PV inverter, meanwhile provides reactive power support to stabilize voltage of power grid, and is conducive to failure recovery.